Electric furnace.



BEST AVAILABLE COP.

. G. MASSIP. ELECTRIC FURNACE. Arpmoumk rum) we. 21, 1912.

Patented Dec. 9, 1913;

INVENTOR BESTAVNLABLE cop.

UNITED STATES PATENT onnion.

GEORGES MASSIP, OF LEVALLOIS-PERRET, FRANCE.

ELECTRIC FURNACE.

Specification of Letters Patent.

Pal-tented Dec. M 3.

Application filed August 21, 1912. Serial No.- 716,269.

15 mea s of an auxiliary 'or starting arc.

jQAccording to'the invention, the act of tilting the'furnace or crucible brings the poles of the auxiliary are into operative posilBiOfi and when the walls reach the necesmy temperature, the furnace is restored-to its normal'position and the main or proper poles become operative. Theinventi'on is illustrated somewhatdiain the accompanying drawa ,e l -is a section of the furnace in its or normal position. Fig. 2 1s a yie'w showing the furnace tilted, to effect 5 the prliini'rmry heating. In carrying the inventioninto effect according to the form illustrated, the walls of the furnace or crucible are made of wheat resisting material which does not giive up carbon. to the metal therein and which in consequence is only a conductor of elec- Itriclty atfhigher temperatures.

. This furnace rests on a metal plate 7), which also forms the conductor or terminal for the lower electrode. The upper electrode is movable independently of the ,furnace and consists of a carbon 0.

When theparts are in the position shown in Fig. 1, there is no are formed even when 'ithe carbon c is lowered into the furnace. Op- ..posite the outlet spout, .Iarrange an auxiliary. metal electro'defd, to which current is led by a bridge connection 6. This auxiliary Inetalpole d cannot become operative jojver the large gap formed when the parts "are, as-shown in'.Fig ..1, audit has no effect on the action when the furnace is heated up and normal position. Tostart the furnace 4 t'hegap between the poles c and dis reduced bytlltingit about o es sin-axis, 0, being con- Ve'nin'fiythe center of the opening of the Tliis temperature is obtained by roof. The opening at the top through which the carbon (2 passes is suitably shaped to permi t of this tilting without interfering with the vertical position of the carbon. In the tilted position, the arcis formed between the pole (i and carbon 0, and this continues until the Walls of the. furnace a, reach the requisite temperature to make them conductors of electricity. When this temperature is attaincd, theiurnace is tilted back into the position shown in Fig.- 1. The bridge connection e may then be opened to break current and the entire operation will proceed between the carbon 0 and the Walls to which latter current is supplied by the metal terminal 5.

Having now fully described my inyeution, what I claim is:

1. A tilting electric furnace of the character described, comprising a roof provided with an opening for the passage of an electrode and for allowing a tilting of the furnace about said opening as center, a second electrode at the bottom of the furnace, means embedded in the furnace walls l:

for forming an auxiliary arc with said. first electrode for heating the furnace. walls and making the same electrically conductive, and

means for producing an are between said first and second electrode through the charge and the furnace wall upon the return of the furnace into its normal position.

2. In a tilting electric furnaceor crucible having walls of a. refractory material which is a. non-conductor of electricity when cold, a stationary electrode at the bottom ofthe furnace, a movable electrode passing through an opening in the roof of the urnaceallowing a tilting of the furnace around said electrode without displacing the same, and an auxiliary electrode inthe side Wall of the furnace for forming an arc with said movable electrode during the tilting of the furnace for heating the walls of the furnace to the requisite temperature for making them conductors of electricity after the fur-' nace has been swung into its normal, nont-ilted position. I

3, In a tilting electric furnace or crucible v having Walls of a refractory material which is a non-conductor ofelectricitylul1en cold,"

a metal plate upon which thebottom of the furnace rests forming the lower electrode, a carbon electrodcgoassing through unopening" in the roof 0 the'furnace allowing a the furnace for heating the walls of the BEST AVAILABLE COP.

tilting of the same about saidepening as a. furnace has been tilted back into its normal center, an auxiliary metal electrode in the position. sidewall of therziurnace opposite the spout thereof, for fornfifig'an. arc with said movin presence of two witnessesv able carbon electrode during-the tilting of GEORGES MAS-SIP.

Witnesses:

LUGIEN Mmmummn,

GEORGE E. LIGHT.

same to the requisite temperature for making them conductors of electricity when the Copies of this patent may be obtained for five cents each, by addressing the; Commissioner of Patents, Washington, I). c.

In testimony whereof I aflix my signature 

